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Water is virtually everywhere, from soil moisture and ice caps, to the cells inside our own bodies.
水幾乎無所不在，從土壤水分及冰帽，到人體內的細胞。
Depending on factors like location, fat index, age, and sex, the average human is between 55-60% water.
依據一些因素，例如所在位置、脂肪、指數、年齡及性別而不同，一般人體內約有 55-60%是水分。
At birth, human babies are even wetter.
剛出生的嬰兒甚至更多。
Being 75% water, they are swimmingly similar to fish.
水分占了全身的75%，和魚的水含量很像。
But their water composition drops to 65% by their first birthday.
然而在周歲前，體內的水分會降至65%。
So what role does water play in our bodies, and how much do we actually need to drink to stay healthy?
那么，水在我們體內扮演什么角色呢？我們該喝多少水來維持健康呢？
The H20 in our bodies works to cushion and lubricate joints,
水在人體內負責緩沖及潤滑關節、
regulate temperature, and to nourish the brain and spinal cord.
調節體溫、滋養大腦及脊髓。
Water isn't only in our blood. An adult's brain and heart are almost three quarters water.
水不只是存在于血液中，成人的腦及心臟幾乎 3/4 是水。
That's roughly equivalent to the amount of moisture in a banana.
大約等同於于1根香蕉的含水量。
Lungs are more similar to an apple at 83%.
肺比較類似蘋果，有83%的水。
And even seemingly dry human bones are 31% water.
甚至看起來干燥的骨頭都含有31%的水。
If we are essentially made of water, and surrounded by water, why do we still need to drink so much?
若我們主要是由水構成，并且生活周遭都有水，為何我們還需要喝那么多水？
Well, each day we lose two to three liters through our sweat, urine, and bowel movements, and even just from breathing.
我們每天流失 2 至 3 公升的水，藉由排汗、大小便，甚至呼吸而流失。
While these functions are essential to our survival, we need to compensate for the fluid loss.
然而這些功能對我們生存又很重要，所以我們需要彌補流失的體液。
Maintaining a balanced water level is essential to avoid dehydration or over-hydration,
維持體內水分平衡是必要的，以避免脫水或體內水分過多，
both of which can have devastating effects on overall health.
兩者皆會對整體健康造成嚴重的影響。
